6638256 has 30 divisors (see below), whose sum is σ = 18578300. Its totient is φ = 2212704.

The previous prime is 6638251. The next prime is 6638263. The reversal of 6638256 is 6528366.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6638256.

It is not an unprimeable number, because it can be changed into a prime (6638251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22906 + ... + 23193.

Almost surely, 2^6638256 is an apocalyptic number.

It is an amenable number.

6638256 is an abundant number, since it is smaller than the sum of its proper divisors (11940044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6638256 is a wasteful number, since it uses less digits than its factorization.

6638256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46113 (or 46104 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 6638256 is about 2576.4813214926. The cubic root of 6638256 is about 187.9394704790.

The spelling of 6638256 in words is "six million, six hundred thirty-eight thousand, two hundred fifty-six".